Commit 9b2dca67 authored by Julius Volz's avatar Julius Volz

Add timeseries documentation.

parent bd7df581
...@@ -5,4 +5,28 @@ sort_rank: 1 ...@@ -5,4 +5,28 @@ sort_rank: 1
# Timeseries # Timeseries
TODO: explain how timeseries are identified and stored. Prometheus fundamentally stores all data as [timeseries](http://en.wikipedia.org/wiki/Time_series).
## Identification
Timeseries are uniquely identified by a _metric name_ and a set of _key-value
pairs_, also known as labels. Changing any label value, including adding or
removing a label, will result in a new timeseries.
Metric names must match the regular expression `[a-zA-Z_:][a-zA-Z0-9_:]`.
## Samples
Samples form the actual data that timeseries consist of. A sample consists of:
* a value with float64-precision
* a timestamp with millisecond-precision
## Notation
Given a metric name and a set of labels, we frequently identify timeseries using this notation:
<metric name>{<label name>=<label value>, ...}
For example, a timeseries with the metric name `api_http_requests_total` and
the labels `method="POST"` and `handler="/messages"` could be written like
this:
api_http_requests_total{method="POST", handler="/messages"}
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